111221016161 has 16 divisors (see below), whose sum is σ = 112475563200. Its totient is φ = 109974882048.

The previous prime is 111221016157. The next prime is 111221016199. The reversal of 111221016161 is 161610122111.

It is a cyclic number.

It is not a de Polignac number, because 111221016161 - 2² = 111221016157 is a prime.

It is a super-2 number, since 2×111221016161² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111221016961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42498125 + ... + 42500741.

It is an arithmetic number, because the mean of its divisors is an integer number (7029722700).

Almost surely, 2^111221016161 is an apocalyptic number.

It is an amenable number.

111221016161 is a deficient number, since it is larger than the sum of its proper divisors (1254547039).

111221016161 is a wasteful number, since it uses less digits than its factorization.

111221016161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4048.

The product of its (nonzero) digits is 144, while the sum is 23.

Adding to 111221016161 its reverse (161610122111), we get a palindrome (272831138272).

The spelling of 111221016161 in words is "one hundred eleven billion, two hundred twenty-one million, sixteen thousand, one hundred sixty-one".